Feed-water system.



W. A. MOFFAT. FEED WATER SYSTEM.

APPLICATION- FILED MAR. l2. I914.

2 SHEETSSHEET I.

Patented N 0v. 30

COLUMBIA PLANOGRAPH c0., WASHINGTON, D Q

W. A. MOFFAT.

FEED WATER SYSTEM APPLICATION FILED MAR. 12. 1914.

Patented Nov. 30, 1915.

2 SHEETSSHEET 2.

COLUMBIA PLANOGRAPH (IO-,WASHXNGTON. n c.

WALTER A. MOFFAT, 0F ERIE, PENNSYLVANIA.

FEED-WATER SYSTEM.

icense.

Specification of Letters Patent.

Patented Nov. 39, 1915.

Application filed. March 12, 1914. Serial No. 824,287.

To all whom it may concern: 7

Be it known that I, WALTER A. MorrAT, a citizen of the United States, residing at Erie, inthe county of Erie and State of Pennsylvania, have invented new and useful Improvements in Feedater 'Systems, of

which the following is a specification.

The invention relates to an improvement in locomotive boilers and particularly to a system for the control of the feed water.

The primary object of the present invention is the division of the boiler into two separate water containing compartments, with means to maintain the pressure of one at a higher degree than the pressure of the other, so that the water of the comparatively high pressure compartment may-be delivered at will to the remaining compartment to assist in the steam generation in the latter, with the effect to prevent the retardation of steam generation under the usual comingling of the initially admitted cold water with the heated water.

The theory of operation is that of providing a closed chamber in which the feed water is admitted, and in which said feed water is brought to a predetermined temperature and under a pressure higher than the pressure in the remaining or steam generating chamber, so that when the water under such temperature and pressure is admitted to the steam generating or evaporating chamber, the heat units thereof will assist rather than retard the steam generation in the evaporating chamber.

The invention in the preferred form of details will be described in the following specification, reference being had particularly to the accompanying drawings, in which:-

Figure 1 is a longitudinal sectional view, partly in elevation, showing the preferred form of the invention. Fig. 2 is a section on line 2-2 of Fig. 1. Fig. 3 is a section on line 33 of Fig. 1. Fig. 4 is a broken view in elevation or plan partly broken out of the boiler. Fig. 5 is a longitudinal section partly in elevation illustrating the application of a slightly modified form of the invention to a boiler. Fig. 6 is a section on line 6-6 of Fig. 5. Fig. 7 is a section on line 7-7 of Fig. 5. Fig. 8 is a broken plan of the modified form.

In the preferred form, illustrated in Figs. 1 to 4: inclusive, I divide the boiler shell 1 so as to present two distinct water chambers 2 and 3, primarily by cutting off the tube end of the boiler from the the box end by a longitudinally extending partition 4: which is disposed between and connected to the respective tube sheets 5 and 6, and at its side edges to the shell. The forward end of the partition 4 is connected through an interposed section 7 to the front tube sheet so that the partition is approximately on what is known as the high water line of the boiler, that is slightly above the base wall 8 interposed between the fire box and the evaporating chamber. There is thus provided at the upper end of the shell a steam chamber 8 above the chamber 3, which steam chamber, or dry chamber is in open communication with the steam chamber or evaporating chamber 9 at the fire box end of the shell. An injector pipe 10 leads from the tank or other suitable source into the cham her 3 below the highest level therein, so that water may be forced into the chamber 3, at will. The chamber 3 is provided with a valve outlet 11, constituting a relief valve, a similar relief valve 12 being provided for the evaporating chamber 9. A feed pipe 13 opens at one end into the chamber 3, at the highest point therein, and at the opposite end into the evaporating chamber 9, the communication being controlled through the medium of valves 14 and 1%.

The steam pipe or dry pipe 15 opens from the trap 16 above and in communication with the evaporating chamber, and leads forwardly, extending longitudinally of the dry chamber 8, to deliver the steam for use. In the operation of this type of the invention, the water in the chamber 3 is heated and through the medium of the heat developed to a predetermined pressure, exceeding that of the pressure in the chambers 2 and 9, the relief valve 11 being set to resist a higher degree of pressure than the relief valve 12. \Vhenever it is necessary to feed water to the steam generating end of the boiler, that is the chamber 9, the valve 14 is open, and by reason of the excess pressure in the chamber 3, the water therefrom will flow to the chamber 9. As previously stated, the water in the chamber 3 has been heated to a predetermined degree. and this is ordinarily in excess of the heat degree of the steam in the chamber 9. Hence, the Water fed to the evaporating chamber aids in the generation of steam therefrom, bringing to the Water in the evaporating chamber a certain number of heat units, which therefore do not have to be supplied by the heating of the water in the evaporating chamber.

In the modified form, as illustrated in Figs. 5 to 8 inclusive, the front tube sheet 20, of the shell 21. is extended to divide the boiler transversely into two distinct compartments 22 and 23, each occupying the full volume of the shell, except for the fire box. The compartments thus provided have independent relief valves 24 and 25, the former communicating with the evaporating or steam compartment, and the latter with municates with the steam space of the chamber 22 and the highest point of the chamber 23, said pipe 29 being provided with a valve 30 and preferably leading into the chamber 23 through the lead end of the feed pipe 27. An auxiliary feed pipe 31 having valve control in the form of both globe and check valves 32, 33, establishes communication bechambers.

tween the chambers, 22 and 23, so that in the event of scarcity of water'in the tank or other source, the steam pressure from the chamber 22 may be utilized to equalize with the pressurein the chamber 23, so that water in the chamber 23 will flow to the same level 1n the chamber 22 through such auxlhary feed pipe. In this form of the device, the

water in the feed Water chamber 23 is heated to a degree and put under pressure in excess ofthe similar conditions of the water in the chamber 22, so that when feeding the water from the chamber 23 to the chamber 22, the feed water aids inthe generation or evaporation into steam, rather than retards vsuch action. -W hat is claimed is A boiler feed water system includingine dependent water receiving compartments, one forming the steam generating chamber, and the other open to the initial supply, the water in the latter compartment being heated to a predetermined degree and held at a pressure in excess of the waterin the.

steam generating chamber, and meansrior controlling communication between the In testimony whereof I afiix 'my' signature in presence of two Witnesses.

WALTER A. MOFFAT. V

V Witnesses:

E. EnMoNsToN, r., D. WV. GOULD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

